Four settings matter most for frame rate, in order: shadows, view distance, global illumination and reflections. Set shadows low, turn global illumination off, and set reflections low.
For aim: aiming coefficient 0%, FOV 90-110, and ADS field of view set to independent.
Season 1 clamps shadows to Low on machines that benchmark well instead of letting them switch off, which closed the old no-shadow visibility trick. View distance caps at 1 km, and DLSS Frame Generation can now be turned off without a restart.